7/24 Nat'l Response Centre-Inbound Sales & Service-Advice/Help Lines. Call Centre Services - North Sydney, NSW . Specialty: Member Programs, Overflow, Relationship Marketing, Retention. Industry: Finance. Hours of Operation: Open 24hrs, Open Evenings, Open Late, Open Monday - Friday, Open Saturdays, Open Sundays. Payment Method: Cheques, Direct Debit, Mastercard, Visa. Service Option: 24hr Turnaround, Emergency Service